Created Unassigned: Attachments with NAME* and FILENAME* parameters [2648]

I've just experienced some e-mails which attachments are like this in body structure:
```
("APPLICATION" "VND.MS-EXCEL" ("NAME*" {18}UTF-8''archive.xls) NIL NIL "BASE64" 63758 NIL ("ATTACHMENT" ("FILENAME*" {18}UTF-8''archive.xls "SIZE" "46592")) NIL NIL)
```
This way the filename is not recognized by ImapX. I'm not sure what the * in the end of the parameters stands for, but for now I simply fixed it by trimming the * in ReadParameterName method.